Derrick.



J. OBSTLER.

DERRIOK.

APPLIOATION FILED APR. 3, 1912.

00 1 1 N n 00 2% mm on M m 6 t a P.

WITNESSES.

J. OBSTLEB.

DERRICK.

APPLIGATION FILED APR. 3, 1912.

Patented Oct. 28, 1913.

2 SHEETS-SHEET 2.

COLUMBIA FLANOGRAPH co., WASHINGTON, D. c.

tmrTnn STATES! PATENT orrron I JOSEPH OBSTLER, OF NEW YORK, N. Y.

DERRICK.

Specification of Letters Patent.

Application filed April 3, 1912. Serial No. 688,151.

To all whom it may concern:

Be it known that I, JOSEPH OBSTLER, a subject of the Empire ofAustria-Hungary, residing at New York, in the county of New York andState of New York, have invented certain new and useful Improvements inDerricks, of which the following is a specification.

My present invention is an improvement in derricks, more particularlytheir foot portion, whereby I provide therein a universal self-oilingjoint.

The drawings show only one of the specific forms and embodiments whichmy invention is adapted to take.

In them, Figure l is a side elevation of a derrick embodying my improvedfoot portion; Fig. 2 is an enlarged view of said foot portion, the viewbeing partly in side elevation and partly in mid-Vertical section: Fig.3 is a horizontal section on the line 3 3 in Fig. 2, looking in thedirection of the arrows; and Fig. 4 is a top plan view of the collarshown detached.

I will now describe the specific devices of the drawings.

Fig. 1 shows a derrick of any usual or preferred type or construction,wherein I have shown my improvement embodied at A. The generalconstruction and operation of this derrick will be understood by thoseskilled in the art and, besides, a detailed description thereof is notnecessary to an understanding of my own improvement A, which is shown ona larger scale in Figs. 2 to 4 inclusive, and which I will now proceedto describe as follows: The foot of the derrick consists of a lowerstationary part 1 adapted to be bolted through holes 2 (Fig. 3) to thederrick-platform 3 (Fig. 1). The foot further comprises an upper movablepart 4 supported on the stationary part 1, to rock or tilt universallythereon by a ball and socket joint next to be described, said upper partt having a cup or socket portion 5 (Fig. 2), which snugly receives downinto it the base of the derrick-mast 6 (Fig. 1), and in front of saidcup having a pair of perforated lugs 7, between which the lower end ofthe derrick-boom 8 is pivoted on a pin 9 (Fig. 1).

The aforesaid ball and socket joint consists of a ball portion 10projecting upwardly from the part 1 and of a socket or cup 11 projectingdownwardly from the part 4 over the ball 10. Y

12 is an annular wall concentric with the base of the ball 10, toprovide an annular oil-receiving recess 14% around the base of said ballfrom which the oil is drawn by capillary attraction up into the spacebetween the ball and socket, and thereby keeps the parts constantlylubricated.

15 is an oil hole through the socket, by which to deliver the oil intothe oil recess 14, said oil running down in the space between the balland the socket, especially Iglolwn the grooves 16 in the surface of the17 is a collar consisting of two half-circular pieces connected by thebolts 18, said collar surrounding the outside of the wall 12 with arigid clamping fit and surrounding the outside of the socket 11 with abearing fit, so that the parts of the ball and socket joint are heldtogether without interfering with the universal play of the joint. Thespace between the aforesaid collar and socket likewise keeps itselfconstantly lubricated from the oil-recess 14.

Of course, it will be understood that changes in details may be madewithout departing from the spirit and scope of the invention and thatthese are intended to be included therein.

What I claim is:

1. The combination in a derrick of a foot port-ion, comprising a lowerstationary part having an upwardly projecting ball; a derrick-mast andboom-supporting upper part, having a downwardly projecting socketreceived on the aforesaid ball; a concentric wall around the base of theball, providing an oil recess, into which the rim of the socket can dip,and means for holding the ball and socket as aforesaid, operativelytogether, said last-mentioned means comprising a collar in boltedtogether parts, which surrounds the aforesaid wall and further surroundswith bearing fit the outside of the socket.

2. The combination with a supporting member, of a derrick member thereonand a foot for the derrick member, comprising relatively movable partssecured respectively to the members, one of said parts having a ballportion and a wall surrounding the same, the other part comprising asocket that receives the ball portion and operates between the same andthe Wall and means engaging both of said parts for holding them inassembled relation While permitting their relative movement.

3. The combination With a supporting member, of a derrick member thereonand a foot for the derrick member, comprising relatively movable partssecured respectively to the members, one of said parts having a ballportion and a Wall surrounding the same, the other part comprising asocket that receives the ball portion and operates between the same andthe Wall, and a collar surrounding the Wall and ball portion andbridging the joint between them.

In testimony whereof I aflix my signature in presence of two Witnesses.

JOSEPH OBSTLER. lVitnesses E. V. SCHERR, Jr., A. C. AIGDONNELL.

Copies of thispatent may be obtained for five cents each, by addressing"the Commissioner of Patentsv Washington. DC.

